Unlike 'Batman', 'Superman' or 'X-Men', 'Split' was unconventional and presented a sui-generis yet contrasting case, if comparisons are to be drawn between various comic book characters. The protagonist Kevin in 'Split' is more of a superhuman rather than a superhero.

Though, the concept of the existence of multiple personalities within an individual is quite known, never has it ever been explored by a mainstream film-maker to such an extent that it represents a part of a film franchise.

Kevin's 23 alter egos will now be seen giving birth to mayhem in Shyamalan's 'Glass', a 2019 release. The official trailer of the film has already been released.

Before we talk about 'Glass' and how with his 13th film, Shyamalan is going to redefine the modern movie trilogy, let us first understand how only he (Shyamalan) director-writer could imagine connecting three different films over a time span of 19 years.

Let us take you back to the game-changing and last scene of 'Split'. Inside a restaurant, the attention of people shifts towards a TV news broadcast explaining the horrors caused by Kevin's split personality. A woman in the restaurant could be seen talking of a similar incident that took place years back in Philadelphia and is unable to recall the name of the culprit involved. The camera then shifts towards David (Bruce Willis), who tells her the man's name and utters – 'Glass'.

The scene in the film happened to hit us like a lightning bolt and gave us a major hint that 'Split' and Shyamalan's 2000 film 'Unbreakable' are related.

'Unbreakable' happened to be M. Night Shyamalan's path-breaking project; the film was named as one of the top ten superhero movies of all time by the Time magazine.

Starring Bruce Willis and Samuel L. Jackson, the movie turned out to be the first instalment in what people are now calling the 'Unbreakable' series. In the film, a man named David Dunn (played by Bruce Willis) happens to be the only survivor on a train crash. He later discovers his superhuman powers with the help of Elijah Price (played by Samuel L. Jackson) a comic art gallery owner.

With the trailer of the 'Glass', one thing is for sure - The film is going to put more weight on Elijah Price's role, that remained unexplored in 'Unbreakable'.

Kevin, David, and Elijah are humans with unusual superpowers, ready to close the series. So, how did M. Night Shyamalan planned these three films with a hundred twists and different plots, over a time period of 19 years? Who could have imagined that years later, Shyamalan would even remember to add James Newton Howard's dark background score (the one used in 'Unbreakable') to Kevin's last monologue in 'Split', which cuts to David's cameo? This means something – M. Night Shyamalan is a spiritual genius and a master storyteller!

This also means that Shyamalan has already modernized the art of making a film trilogy. Once, he mentioned in an interview, “The idea of doing a traditional sequel doesn't inspire me. It has to be organic and has to come from the right place — otherwise, it'll smell of artificiality. But it's fascinating how much it's stuck around. I do think about it a lot.”

'Unbreakable' happened to be amongst the first few films in the superhero franchise. The film released months after the first instalment of Brian Singer's 'X-Men' hit the theatres. Shyamalan didn't mention 'Unbreakable' to be a superhero film during the film promotions and marketing.

Trilogies like 'The Matrix', 'Spider-Man' and even Christopher Nolan's 'The Dark Knight' have got their own themes and styles, M. Night Shyamalan's 'Glass' might create its own benchmarks and change the narrative about the modern day trilogy.